Yes. I needed access to this object from the flash service (see [here](https://github.com/hypothesis/h/blob/5bb6d87a78a404771fc4ca156e9721ea287a516c/h/js/flash.coffee#L23)), and I could not do it any other way.
I tried the usual dependency-injection stuff, but it did not seem to work in this case. (I am guessing circular dependencies.)

Anyway, we have the same in the host/guest frames, too, so I guessed having this single variable in the main namespace will not hurt.

Feel free to suggest another way.